The age submenu has full flexibility for selecting age ranges:
- Press 'A' to select a grouping (eg 10-year groups) from a submenu.
- Press 'B' or 'C' to delete or split the highlighted group.
- Press 'D' / 'E' / 'F' / 'G' to extend the highlighted group up or down.
- Press '=' (or ESC) to return to the Main Menu.